diff --git a/iLcatraz/ITunesService.m b/iLcatraz/ITunesService.m
index 55c3d35..05de4e8 100644
--- a/iLcatraz/ITunesService.m
+++ b/iLcatraz/ITunesService.m
@@ -143,7 +143,7 @@ + (NSString*)descriptor2json:(NSAppleEventDescriptor*) descriptor
                     [ret appendString:item];
                 }
             }
-            if (ret==NULL) return NULL;
+            if (ret==NULL) return @"[]";
             return [[@"[" stringByAppendingString:[NSString stringWithString:ret]] stringByAppendingString:@"]"];
         }
         case 'cUsP': {